Tactic101 wrote:
If x = 9b - 3ab / (3/a - a/3), what is x?
(1) 9ab / 3+a = 18/5
(2) b = 1
x = 9b - 3ab / (3/a - a/3)
= 3b(3 - a)/{(9 - a^2)/3a}
= 9ab/(3 + a)
(1) 9ab / 3+a = 18/5
—> x = 18/5.
Sufficient
(2) b = 1
We don’t know the value of a.
So, Insufficient
IMO Option A.
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